Caliper braking system for aircraft landing gear having a plurality of brake disk clamping zones

ABSTRACT

A braking system for aircraft landing gear including a plurality of clamping zones for clamping a brake disk. The braking system comprises an actuator, a caliper, a rim rotatable about an axis of rotation, and the brake disk, which is floatingly mounted relative to the rim. The caliper comprises a stationary inner support, a movable intermediate support, and an outer support that is hinged relative to the inner support. Under action of the actuator, the movable intermediate support moves and causes the brake disk to move so that the brake disk is clamped between the intermediate support and the outer support, and then causes the outer support to tilt so that the brake disk is damped between the inner support and the outer support.

CROSS-REFERENCE TO RELATED APPLICATION'S

This application claims priority to French patent application No. FR1800600 filed on Jun. 12, 2018, the disclosure of which is incorporatedin its entirety by reference herein.

BACKGROUND OF THE INVENTION (1) Field of the Invention

The present invention relates to a caliper braking system for wheeledaircraft landing gear, the system having a plurality of brake diskclamping zones, and the invention also relates to wheeled landing gearincluding such a braking system and to an aircraft including such abraking system.

(2) Description of Related Art

A known braking system for aircraft comprises at least one brake and abrake disk floatingly mounted relative to a rim carrying a tire. Eachbrake is configured to brake the brake disk and consequently the rim.Conventionally, a brake comprises an actuator acting on brake pads inorder to clamp the brake disk by means of said brake pads. The actuatoris generally hydraulic.

The term “brake disk floatingly mounted relative to the rim” is used todesignate a brake disk that is movable relative to the rim so as toenable the brake disk to perform movements of small amplitudes relativeto the rim in order to avoid transmitting excessive mechanical stressesbetween the brake disk and the rim. Nevertheless, the brake diskincludes constraining elements that co-operate with the rim so as toensure the rim and the disk are still connected together in rotation.

Furthermore, a braking system for wheeled aircraft landing gear mayinclude a plurality of actuators, e.g. four or six actuators, that, aredistributed in regular manner around the axis of rotation of the landinggear wheel. Such a braking system thus acts in substantially uniformmanner on the brake disk under the actions of the brake actuators whilebraking.

A braking system for wheeled aircraft landing gear may equally wellcomprise a single brake, as described in Document PR 3 007 096. Such abrake has a single actuator acting on a caliper provided with astationary jaw and a movable jaw carrying respective brake pads. Whilebraking, such a braking system then acts asymmetrically on the brakedisk under the action of the actuator. Furthermore, the force needed forbraking is supplied by a single actuator, which therefore needs to bedimensioned accordingly, and which can be difficult to install in theaircraft landing gear.

Document FR 3 018 380 discloses an electromechanical actuator that isusable in such a braking system.

In addition, a brake disk for aircraft landing gear is generallyprovided with a braking track carrying first teeth that form tenons. Thefirst teeth are distributed circumferentially relative to a circlecentered on a central axis of the brake disk, each first tooth extendingradially relative to the central axis. Each first tooth extendscircumferentially between two facets.

The rim is also provided with second teeth, two edges of two adjacentsecond teeth circumferentially defining a notch forming a mortisesuitable for receiving a tenon of the brake disk.

Under such circumstances, each first tooth is positioned in a notch, thetwo facets of a first tooth facing two edges of two different secondteeth. Each first tooth is thus arranged circumferentially between twoedges of two second teeth. Two functional gaps thus liecircumferentially between the facets of a first tooth of the disk andtwo corresponding second edges of the rim. As a result, the first teethof the brake disk constitute elements for constraining the brake disk torotate with the rim about the axis of rotation of the rim.

In addition, each second tooth may carry two clips adjacent to itsedges. Such clips may be attached to the rim by screws or rivets.Likewise, at least one clip may be fastened to each first tooth.

In addition, a brake wire may be fastened to the rim so as to prevent afirst tooth leaving a notch axially.

Such a brake disk is sometimes used within a braking system having asingle brake or else a plurality of brakes that are not regularlydistributed around the axis of rotation of the wheel. During braking,the two facets of a first tooth of the brake disk may then be subjectedto forces in alternation. This can give rise to pulsed forces beingapplied to the rim and to any running gear mounted on the rim. Inaddition, the brake disk can oscillate in the rim and can generatevibration in the brake(s).

These phenomena tend to contribute to premature wear of the interfacebetween the brake and the rim and/or to the appearance of vibration thatis audible, and/or to fatigue stresses.

The prior art of the invention includes Document U.S. Pat. No.3,016,111, which describes a brake caliper having a stationary supportfor a first friction pad and a movable support for a second frictionpad. The movable support is hinged by means of two links in order tohold the second friction pad substantially parallel to the brake disk.

Document U.S. Pat. No. 2,586,518 describes a mechanical braking devicepositioned inside an aircraft wheel and comprising a stationary plateand a plate that is movable along the axis of the wheel. Those twoplates serve to clamp a disk that is constrained to the wheel andthereby brake rotation of the wheel.

Document EP 3 181 935 describes a braking device having a calipercarrying two tilting pads situated on either side of the brake disk.Each pad has a first end that is mounted to pivot relative to thecaliper and the brake disk, and a second end that is moved intranslation by a screw-and-nut system so as to cause these second padends to move towards each other or apart from each other, therebyclamping or releasing the brake disk.

Furthermore, the technological background of the invention includesDocument U.S. Pat. No. 7,316,301, which discloses a brake caliper.

BRIEF SUMMARY OF THE INVENTION

An object of the present invention is to propose a braking systemserving to obviate the above-mentioned limitations by using a pluralityof clamping zones between a brake disk and a caliper, firstly in orderto amplify the braking force generated by an actuator so as to limit thedimensions of the actuator, and secondly so as to distribute the brakingforces substantially uniformly over the brake disk in order to optimizethe operation and the lifetime of the braking system.

The present invention thus provider, a caliper braking system forwheeled aircraft landing gear, the system having a plurality of zonesfor clamping the brake disk, and the invention also provides landinggear including such a braking system, and an aircraft including such abraking system.

According to the invention, a braking system for wheeled aircraftlanding gear comprises:

at least one actuator;

at least one caliper provided with a plurality of supports, each supportincluding at least one pad;

a rim movable in rotation about an axis of rotation AXROT1; and

a brake disk floatingly mounted relative to the rim, the brake diskincluding constraining elements that co-operate with notches in the rim.

The braking system of the invention is intended in particular for thewheeled landing gear of rotary wing aircraft. Each wheel of such landinggear comprises a rim and a tire that are constrained to each other.

This braking system is remarkable in that said at least one calipercomprises a stationary inner support, a movable intermediate supportthat is movable under the action of an actuator, and an outer supporthinged relative to the stationary inner support, the brake disk beingarranged firstly between the intermediate support and the outer support,and secondly between the inner support and the outer support, at leastone pad being positioned between each support and the brake disk, suchthat under action of the actuator, the movable intermediate supportmoves and begins by causing a first movement of the brake disk so thatthe brake disk is clamped by means of the pads between the intermediatesupport and the outer support, and then continues to cause a secondmovement of the outer support 30 that the brake disk is clamped by meansof the pads between the inner support and the outer support.

By way of example, the actuator may be a linear actuator, such as anelectrical, electromechanical, or indeed hydraulic actuator that causesthe intermediate support to move along a clamping direction DIR1. Theclamping direction DIR1 is substantially parallel to the axis ofrotation AXROT1 of the rim.

The outer support is hinged relative to the inner support about a pivotaxis AXROT2 so that the braking system includes at least one zone forclamping the brake disk on either side of the pivot axis AXROT2.Preferably, the pivot axis AXROT2 is arranged substantiallyperpendicularly to a plane containing the clamping direction DIR1 andthe axis of rotation AXROT1 of the rim.

As a result, a caliper has a plurality of clamping zones for clampingthe brake disks, two supports situated on either side of the brake diskincluding one pad per clamping zone, for example. The intermediatesupport thus co-operates with the outer support in order to form a firstzone for clamping the brake disk while the inner support co-operateswith the outer support in order to form at least one second clampingzone, and possibly a plurality of clamping zones for clamping the brakedisk.

For this purpose, the intermediate support is preferably-provided with asingle pad, while the inner support is provided with at least one padand the outer support is provided with at least two pads. The brake diskis thus clamped following action of the actuator, firstly between thepad of the intermediate support and one pad of the outer support, andsecondly between at least one pad of the inner support and at least onepad of the outer support.

In a first embodiment, a braking system has two zones for clamping thebrake disk and a caliper that is provided with an inner support having asingle pad, an intermediate support having a single pad, and an outersupport having two pads.

In a second embodiment, a braking system has three clamping zones and acaliper chat is provided with an inner support having two pads, anintermediate support having a single pad, and an outer support havingthree pads.

As a result, during action of the actuator, the intermediate supportmoves parallel to the clamping direction DIR1. First contact between thebrake disk and the pad of the intermediate support then takes place. TheIntermediate support continues to move parallel to the clampingdirection DIR1 under action of the actuator, thereby giving rise to afirst movement and/or a first deformation of the brake disk by means ofthe intermediate support. Second contact then takes place between thebrake disk and the pad of the outer support.

The intermediate support continues to move parallel to the clampingdirection DIR1 under action from the actuator, thereby giving rise tothe first movement and/or the first deformation of the brake disk and topivoting of the outer support about the pivot axis AXROT2. Third contactthen takes place between the brake disk and at least one pad of theouter support. The intermediate support continues to move parallel tothe clamping direction DIR1 under action from the actuator, therebygiving rise to the first movement and/or the first deformation of thebrake disk, to pivoting of the outer support, and to a second movementand/or a second deformation of the brake disk by means of the outersupport. Fourth contact then takes place between the brake disk and atleast one pad of the inner support.

The brake disk is thus clamped by means of the pads firstly between theintermediate support and the outer support, and secondly between theinner support and the outer support. The braking system of the inventionthus advantageously serves to multiply the number of brake disk clampingzones, while limiting the number of actuators that are needed.

The action of a single actuator thus enables a plurality of brake diskclamping zones to be obtained and serves advantageously to multiply theforce that is generated by the actuator in order to obtain an amplifiedbraking force. The force generated by the actuator, and consequently itsdimensions, can therefore be limited compared with a prior art brakingsystem, thereby making it easier to install in the aircraft landinggear.

Consequently, the braking system may have a single actuator and a singlecaliper while delivering a braking force that is large and sufficient.

The braking system may also include at least two actuators and at leasttwo calipers, with each actuator co-operating with a single caliper,e.g. in order to reduce the dimensions of each actuator, as a functionof the volume available for installing the actuator.

Furthermore, the presence of a plurality of clamping zones for thebraking system of the invention serves advantageously to distribute thebraking force over that plurality of clamping zones, preferably inuniform manner, thereby limiting or indeed avoiding the appearance ofvibration and/or of pulsed forces in the braking system, or indeedlimiting or avoiding any transmission thereof to the rim and to therunning gear mounted on the rim. This serves to improve the operationand the lifetime of the braking system of the invention.

Furthermore, the pivot axis AXROT2 is preferably arranged so as tointersect the axis of rotation AXROT1 of the rim, and so as to besituated in a midplane P1 of the brake disk. The term “midplane P1” isused to mean a plane that is parallel to and equidistant from the outerfaces of the brake disk that come into contact with the pads.

As a result, a substantially equal force is applied to the clampingzones on either side of the pivot axis AXROT2. By way of example, thisforce is substantially equal to the force from the actuator. Under suchcircumstances, the clamping zones of the braking system of the inventionare preferably of identical dimensions. The clamping zones of thebraking system of the invention are then distributed regularly and insubstantially uniform manner relative to the pivot axis AXROT2.

Nevertheless, the pivot, axis AXROT2 may be offset from that position soas to obtain forces that differ depending on the positions of theclamping zones relative to the pivot axis AXROT2, in particular when thenumber of clamping zones on either side of the pivot axis AXROT2 aredifferent or when the dimensions of the those clamping zones on eitherside of the pivot, axis AXROT2 are different. The clamping zones of thebraking system of the invention are then distributed irregularlyrelative to the pivot axis AXROT2.

By way of example, the pivot axis AXPOT2 may be offset relative to theaxis of rotation AXROT1 in a direction that is perpendicular to the axisof rotation AXROT1 and to the pivot axis AXROT2.

In another example, the pivot axis AXROT2 may be offset relative to themidplane P1 of the brake disk in a direction parallel to the axis ofrotation AXROT1.

The pivot axis AXROT2 may equally well be offset simultaneously relativeto the axis of rotation AXROT1 in a direction that is perpendicular tothe axis of rotation AXROT1 and to the pivot axis AXROT2, and alsorelative to the midplane P1 of the brake disk in a direction parallel tothe axis of rotation AXROT1.

The present invention also provides wheeled aircraft landing gearincluding at least one braking system as described above.

The present invention also provides an aircraft including wheeledlanding gear having at least one braking system as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention and its advantages appear in greater detail from thecontext of the following description of examples given by way ofillustration and with reference to the accompanying figures, in which:

FIG. 1 is a view of aircraft landing gear having a braking system of theinvention;

FIG. 2 is a view of a brake disk of such a braking system;

FIG. 3 is a view of a rim of such a braking system:

FIGS. 4 and 5 show a first embodiment of the braking system;

FIG. 6 shows a second embodiment of the braking system; and

FIG. 7 shows a third embodiment of the braking system.

DETAILED DESCRIPTION OF THE INVENTION

Elements present in more than one of the figures are given the samereferences in each of them.

The aircraft may in particular include wheeled landing gear 5. Thewheeled landing gear 5 possesses a landing gear leg 6 carrying both awheel axle and a braking system 10.

The braking system 10 is provided with a rim 20 that is movable inrotation about an axis of rotation AXROT1, a brake disk 40 thatco-operates with the rim 20, and also an actuator 11 with a caliper 12.Thus, during a braking action, the actuator 11 acts on the caliper 12 soas to clamp the brake disk 40 by means of pads 35, 36, 37 included inthe caliper 12, so as to brake rotation of the brake disk 40, andconsequently rotation of the rim 20.

Conventional bearing device may be arranged between the rim 20 and thewheel axle. In addition, the rim 20 carries a tire that is not shown forconvenience. FIGS. 4 to 7 show embodiments of the braking system 10 inwhich the rim 20 is not shown for greater clarity.

FIG. 2 shows a brake disk 40 of such a braking system 10 for anaircraft. The brake disk 40 has a hollow central portion 43 and aplurality of constraining elements 42 formed by first teeth that extendsubstantially radially outwards from the brake disk 40. The brake disk40 is of constant thickness, extending front a first disk face 53 to asecond disk face 56.

Furthermore, FIG. 3 shows a rim 20 of such a braking system 10. The rim20 is provided with a rim body 21 suitable for carrying a tire and itincludes notches 29 that are open towards the outside of the rim 20 andthat are distributed circumferentially around the axis of rotationAXROT1 of the rim 20. Each notch 29 is defined by a wall that issubstantially U-shaped.

The brake disk 40 is floatingly mounted relative to the rim 20, as shownin FIG. 1. Specifically, the brake disk 40 is movable relative to therim 20 so as to allow it to perform movements of small amplitudes, withthe constraining elements 42 of the brake disk 40 co-operating with thenotches 29 of the rim 20 so that the rim 20 and the brake disk 40 areconstrained to rotate together about the axis of rotation AXROT1.Consequently, the transmission of mechanical stresses between the brakedisk 40 and the rim 20 is limited.

In FIGS. 4 to 7, the caliper 12 of the braking system 10 has a pluralityof clamping zones for clamping the brake disk 40. A first embodiment ofthe braking system 1G, as shown in FIGS. 4 and 5, has two brake diskclamping zones, while second and third embodiments of the braking system10 as shown respectively in FIGS. 6 and 7 have three brake disk clampingzones.

In a manner that is common to all of these embodiments, the caliper 12has a stationary inner support 31, a movable intermediate support 32,and an outer support 33 that is hinged about a pivot axis AXROT2 topivot relative to the stationary inner support 31. The brake disk 40 isarranged firstly between the intermediate support 23 and the outersupport 33, and secondly between the inner support 31 and the outersupport 33, as shown in FIGS. 4 to 7. Each support 31, 32, 33 has atleast one pad 35, 36, 37 arranged so as to be positioned between asupport 33, 32, 33 and the brake disk 40.

The actuator 11 is constrained to the stationary inner support 31. Theactuator 11 is a linear actuator, such as an actuator that iselectrical, electromechanical, or indeed hydraulic, and it includes amovable rod 15 suitable for moving in translation along a clampingdirection DIR1. The clamping direction DIR1 is parallel to the axis ofrotation AXROT1. The inner support 31 has a first passage 38 allowingthe movable rod 15 of the actuator 11 to act directly on theintermediate support 32 causing it to move parallel to the clampingdirection DIR1. Furthermore, the movable rod 15 and the intermediatesupport 32 may constitute a single part.

In addition, the braking system 10 includes at least one pivot pin 34arranged along the pivot axis AXROT2 between the inner support 31 andthe outer support 33 thus forming a pivot connection between the innersupport 31 and the outer support 33. The inner support 31 and the outersupport 33 are preferably connected together by a pivot pin 34 in thehollow central portion 43 of the brake disk 40, thereby advantageouslylimiting the overall size of the braking system 10. In addition, theinner support 31 and the outer support 33 include a second passage 39 onthe axis of rotation AXROT1 serving in particular to pass the wheel axlethat supports the rim 20.

The pivot axis AXROT2 is arranged substantially perpendicularly to aplane containing the clamping direction DIR1 and the axis of rotationAXROT1 of the rim 20. In addition, in the first and second embodimentsof the braking system 10, the pivot axis AXROT2 is arranged so as tointersect the axis of rotation AXROT1 and lies in a midplane P1 of thebrake disk 40, the midplane P1 being parallel to and equidistant fromthe first disk face 53 and the second disk face 56 of the brake disk 40.

In the third embodiment of the braking system 10, the pivot axis AXROT2is arranged so as to be offset firstly from the midplane P1 of the brakedisk 40 parallel to the axis of rotation AXROT1, and secondly relativeto the axis of rotation AXROT1 in a direction perpendicular to the axisof rotation AXROT1 and to the pivot axis AXROT2.

Advantageously, the caliper 12 of the braking system 10 thus includes atleast one zone for clamping the brake disk 40 on either side of thepivot axis AXROT2. For each clamping zone, two supports 31, 32, 33situated on either side of the brake disk 40 carry respective pads 35,36, 37.

In the first embodiment, the intermediate support 32 co-operates withthe outer support 33 to form a first zone for clamping the brake disk40, while the inner support 31 co-operates with the outer support 33 toform a second clamping zone. The inner support 31 and the intermediatesupport 32 then carry respective single pads 35, 36, while the outersupport 33 carries two pads 37. These two clamping zones may be ofidentical dimensions, as shown in FIG. 4.

In the second and third embodiments, the intermediate support 32co-operates with the outer support 33 in order to form a first zone forclamping the brake disk 40, whereas the inner support 31 co-operateswith the outer support 33 in order to form both a second clamping zoneand a third clamping zone. The inner support 31 thus has two pads 35,the intermediate support 32 thus has a single pad 36, and the outersupport 33 has three pads 37. In the second embodiment, these threeclamping zones are of identical dimensions, as shown in FIG. 6, therebyserving to balance clamping of the brake disk and to obtain wear that issubstantially uniform. In the third embodiment, the second and thirdclamping zones are of smaller dimensions than the first clamping zone,as shown in FIG. 7, thus serving to compensate for the pivot axis AXROT2being offset relative to the midplane P1 of the brake disk 40 andrelative to the axis for rotation AXROT1, thereby balancing clamping ofthe brake disk in spite of the offset.

In these second and third embodiments, the clamping zones of the brakingsystem 10 are angularly distributed in regular manner around the axis ofrotation AXROT1. Nevertheless, the angular distribution of the clampingzones of the braking system 10 about the axis of rotation AXROT1 couldbe irregular, regardless of whether the clamping zones are of dimensionsthat are identical or different, without degrading the operation and theadvantages of this braking system 10.

During a braking action of the braking system 10, the actuator 11generates movement along the clamping direction DIR1 of the movable rod15, thereby moving the intermediate support 32 parallel to the clampingdirection DIR1. The pad 36 on the intermediate support 32 is thentouching the brake disk 40. The intermediate support 32 then continuesto move parallel to the clamping direction DIR1 under the action of theactuator 11, leading to a first movement and/or a first deformation ofthe brake-disk 40 driven by the pad 36 on the intermediate support 32.The pad 37 of the outer support 33 then touches the brake disk 40, thebrake disk 40 thus being clamped between the pads 36 and 37 of theintermediate support 32 and of the outer support 33.

The intermediate support 32 continues to move parallel to the clampingdirection DIR1 under the action of the actuator 11, thereby causing thefirst movement and/or the first deformation of the brake disk 40 andalso pivoting of the outer support 33 about the pivot axis AXROT2relative to the stationary inner support 31. At least one pad 37 of theouter support 33 then touches the brake disk 40. The intermediatesupport 32 continues to move parallel to the clamping direction DIR1under the action of the actuator 11, thereby giving rise to the firstmovement and/or the first deformation of the brake disk 40, to pivotingof the outer support 33, and to a second movement and/or a seconddeformation of the brake disk 40 driven by the outer support 33. Atleast one pad 35 of the inner support 31 then touches the brake 40, sothat the brake disk 40 is thus clamped between the pads 35, 37 of theinner support 31 and of the outer support 33.

The brake disk is thus clamped over a plurality of clamping zones bymeans of the pads 35, 36, 37, firstly between the intermediate support32 and the outer support 33, and secondly between the inner support 31and the outer support 33. The force generated by the actuator 11 canthus advantageously be multiplied in order to obtain an amplifiedbraking force.

Preferably, the braking system 10 may include a single actuator 11 and asingle caliper 12, as shown in FIGS. 4 to 7, while still delivering abraking force that Is large and sufficient.

Naturally, the present invention may be subjected to numerous variationsas to its implementation. Although several embodiments are described, itwill readily be understood that it is not conceivable to identifyexhaustively all possible embodiments. It is naturally possible toenvisage replacing any of the means described by equivalent meanswithout going beyond the ambit of the present invention.

What is claimed is:
 1. A braking system for wheeled aircraft landinggear, the braking system comprising: at least one actuator; at least onecaliper provided with a plurality of supports, each support including atleast one pad; a rim movable in rotation about an axis of rotation; anda brake disk floatingly mounted relative to the rim, the brake diskincluding constraining elements that co-operate with notches in the rim;wherein the at least one caliper comprises a stationary inner support, amovable intermediate support that is movable under the action of anactuator, and an outer support hinged relative to the inner support, thebrake disk being arranged firstly between the intermediate support andthe cuter support, and secondly between the Inner support and the outersupport, at least one pad being positioned between each support and thebrake disk, such that under action of the actuator, the movableintermediate support moves and begins by causing a first movement of thebrake disk so that the brake disk is clamped by means of the padsbetween the intermediate support and the outer support, and thencontinues to cause a second movement of the outer support so that thebrake disk is clamped by means of the pads between the inner support andthe outer support.
 2. The braking system according to claim 1, whereinthe braking system has a single actuator and a single caliper.
 3. Thebraking system according to claim 1, wherein the braking system has atleast two actuators and at least two calipers, with each actuatorco-operating with a single caliper.
 4. The braking system according toclaim 1, wherein the at least one caliper has an inner support providedwith at least one pad, an intermediate support provided with one pad,and an outer support provided with at least two pads, the brake diskbeing clamped following the action of the actuator, firstly between thepad of the intermediate support and one pad of the outer support, andsecondly between at least one pad of the inner support and at least onepad of the outer support.
 5. The braking system according to claim 4,wherein the at least one caliper has an inner support provided with onepad, an intermediate support provided with one pad, and an outer supportprovided with two pads.
 6. The braking system according to claim 4,wherein the at least one caliper includes an inner support having twopads, an intermediate support provided with one pad, and an outersupport provided with three pads.
 7. The braking system according toclaim 1, wherein the outer support is hinged relative to the innersupport about a pivot axis arranged perpendicularly to a planecontaining the axis of rotation of the rim and a clamping directioncorresponding to a movement direction of the intermediate support underaction of the actuator.
 8. The braking system according to claim 1,wherein the pivot axis is arranged so as to intersect the axis ofrotation and is situated in a midplane of the brake disk.
 9. The brakingsystem according to claim 7, wherein the pivot axis is offset relativeto the axis of rotation in a direction perpendicular to the axis ofrotation and to the pivot axis.
 10. The braking system according toclaim 7, wherein the pivot axis is offset relative to a midplane of thebrake disk in a direction parallel to the axis of rotation.
 11. Wheeledlanding gear, wherein the wheeled landing gear includes at least onebraking system according to claim
 1. 12. An aircraft including wheeledlanding gear and wherein the wheeled landing gear includes at least onebraking system according to claim 1.